Other people have different rules, like never joining any of them, or sending invitations to everyone they can think of; I can respect that.
The damn sites are proliferating wildly. The Social Networking Services Meta List has a whole raft of these things.
It just amazes me how many of these things there are.
I don't put any personal info in the things because I can't be bothered--it's not paranoia, just tedium--for one thing, my info is changing too often for me to keep up. In fact, I haven't bothered posting a picture for a while, either.
Every one of these things seems to have its own hook and its own particular lameness. Part of me wishes sixdegrees had figured out a business model so there wouldn't be so damn many of these sites. Then again, there might still be. I also wish there were some way to aggregate these links (is there?) but evidently everyone's playing the proprietary database game.
Any of them come up with a good way to make money yet?